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北航考研复试15专业英语msei.pptx

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Phase Transformation in Metals;Phase transformation;The Kinetics of Solid-State Reaction;Homogeneous nucleation;Heterogeneous nucleation;Growth;Isothermal transformation diagram Time-Temperature-Transformation (TTT);Pearlite;Bainite;Bainite;Martensite;Continuous Cooling Transformation Diagrams (CCT);Tempered Martensite;Proeutectoid signifies is a phase that forms (on cooling) before the eutectoid austenite decomposes. It has a parallel with primary solids in that it is the first phase to solidify out of the austenite phase. Thus, if the steel is hypoeutectoid it will produce proeutectoid ferrite and if it is hypereutectoid it will produce proeutectoid cementite. ;Iron alloy phases Austenite (γ-iron; hard) Bainite Martensite Cementite (iron carbide; Fe3C) Ledeburite (ferrite - cementite eutectic, 4.3% carbon) Ferrite (α-iron, δ-iron; soft) Pearlite (88% ferrite, 12% cementite) SpheroiditeTypes of Steel Plain-carbon steel (up to 2.1% carbon) Stainless steel (alloy with chromium) HSLA steel (high strength low alloy) Tool steel (very hard; heat-treated) Other Iron-based materials Cast iron (2.1% carbon) Wrought iron (almost no carbon) Ductile iron

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